Magneto



Dec. 9, 1924. 1,518,591

S. C. MCKEOWN Y MAGNET() Filed Jan. 17, 1921 3 Sheets-Sheet l 66 ,01e 7/ 44 a 1f n 1 l ,62 f 1l l x o I 52 16 v 45 5 l 1 l a 1 I 4Z 3 Z7 Q ,Mm

a 7 v Samuel GMceoM/n ma @M9- f" q, I afb-47 Dec. 9, 1924. 1,518,591 l s. c. Mcm-:OWN

MAGNETO Filed Jan. 1'7, 1921 3 Sheets-Sheet Ml VE N TOR Sammie( C Mcleown n@ WMM? Dec. 9

1,518,591 s. C. MGKEowN MAGNETO Filed Jan. 17, 1921 3 sheets-sheer s IN1/Emol? Samuef CMC. Iieown A TTOHNEY Patented Dec. 9, 1924,

UNITED STATES SAMUEL MCKFOVN, OF NEWARK, NElf JERSEY, ASSIGi-NDR T10 SFLITDO'RF ELEGTRI" CAL COMPANY, O?? NEWJXRE, NEW' MAGNET() Application filed January l?, 1921. Serial No. 437,790.

To /iZZ 107mm t may concern:

Be it known that l, SAMUEL (lD/lcluown, a citizen. oic the United States9 residing at Newark, in the countyk oit Essex, State ot New Jersey, have invented certain new and uset'ul Improvements in Magnetos, of which the following; is a description, reference being had to the accompanying drawing and to the iigures of reference marked thereon.

This invention relates to magnetos and particularly to magnetos wherein a rotor bearing isolated. magnetic inductors switches i the flux from. a permanent magnet, in alteruately opposite directions, through a sott iron core bearing a coil in order to induce a current of electricity in the coil.

The main lobject of this invention is to provide a neat compact and efficient magneto of the above mentioned type.

-Another object of this invention is to simplify the construction of a magneto so as to provide a minimum number of parts and so as to decrease the cost of manufacture thereof.

A further object of this invention is to construct a magneto so that the parts thereof may be arranged compactly for shippin and of which the parts may be subsequently assembled with ease.

Other and further objects of this invention will appear after reading` the following' specification and claims in which- Figure l is a side view oi my magneto, the cover and permanent magnet beingf shown in section so as to etpose some of the interior parts. y

Figure 2 is an end view of the base ot the magneto with the oil cup removed.

Figure 3 is a similar view of the opposite side of the base of the magneto.

Figure 4- is a section through the base and rotor of the magneto.

Figure 5 is a view of the core of' the magneto, together with the parts carried thereby, a portion beingbroken away to eX pose some contacts.

Figure 6 is a view looking' toward the iu-` terior of my cover of the magneto.

Figures 71 8 and 9 are views ot some details of my invention and Figure 10 is a diagram of the electrical connections ot my magneto and how it is to be connected in a spark plugcircuit.

In the accompanying figures. like reference characters refer to the same parts The magneto compris s, neto hase lnivinnsets oi I ded therein, and havinf the base a rotor cocine with the pole pieces. ilso a s the sets ot pole pieces and as s '/e units are a permanent mag-net a t iron core bearing an induction coil and i set of malte und break contacts. Secured to the base a cover enclosing' the n'iagnet.j co coil and contacts, suitable terminals bein `provided to conduct the current from the coil.

Now reterring;v more in detail to the various parts7 the magneto base comprises a caste infr l of nonfinalggnetio n'laterial such as nlun'iiuuni. embedded in which are two` sets ot opposed pole pieces 2, i?, and 8 respectively. one end of cach oi the pole pieces being- Hush with one end of the base and each oit the sets 2 beine' built un ot laminations*held together by means of rivets if? whiie the sets ot pole pieces 3 3 are each comnosed oit' laminations bound in together with and in between two solid blocks ot sott iron 5, Cast in the aluminum base is a bearing; preferably oi1 brass, said bearing; having a restricted portion 6 extending; well into the base to forni a sunport .tor the rotor soon to be described. and also having' an enlarged portion Z into which is driven a raceway 8 for a ball bearing o? which the inner raccwav 9 is driven onto the she'tt ot' the rotor. Balls l0 con'iiiiletc the ball bearing. The liuass beari provided with an oil duct il infovided with an oil cun i2 having* a shrine` closed cover 13. spiral e'roove 14 encircles the bearing` to feed oil to the arnjiature shaft. The base is provided with a pair of ears 15 nrovided with apercures 1G tor use when theinagneto is to be used as an oscillaton as will he understood by those skilled in the art.

The rotor is of the type wherein lobes of magnetic material. are bound in with a casting-Aoi" some non-magnetic material. In this instance the rotor Vcomnrises two sets of laminations .17 17 bound in with a body of aluminum i8, the body o? aluminum beingrr cupped as at i9 so as to enable the rotor to encompass the protruding' portion 6 of the bearing'. Cast into the aluminum body is a shaft 20. turned down out of hexagonal stock leaving' two integral hexagonal bind ing: portions 21 as is shown in Figure L the aluminum body 18 being thereby rigidly iaguetically ceiated 'with fili held against lateral or rotative inclement on the shaft 2i) The shaft is held in place against longitudinal iinovement by means of a split ring 22 seated. in a groove 2? in the shaft 2O and abutting the inner racc 9, thereby also holding the race in place. i spring 24 snapped around the split portions of the ring holds them together. A cover plate covers the bearing' and protects the same against entrance of foreign deleterious mat-tr The inirestrained end of the shaft is provided with. a cani 2G. The cani is provided with a pair of arcuate slots 2T, and a pair of s "evfs 2S passing through holes 20 in a plate 30 and the slots 527 serre to bind the cani to the rotor in any desired adjusted position for advancing and retarding the time oi' make and break of the circuit ;;i.iit1 ,l.lirig device soon to be described.

Associated 'with one pair of pele pieces :for example 2l, f'l is a pern'ianent .magnet 3l held in place magnetically, and restrained in ]iosition by incluis of spring 32 inten posed between the magnet 3l and a cover 253, which cover, as hereinbefore stated, conn pletely encloses the permanent magnet7 an induction coil and circuit controller. The spring 32 is provided with a cut out portion 33 embracing a protuberance in the cover to maintain the spring against shifting movement and projections 35 and 36 on the spring press laterally against the cover to prevent the spring from falling out when the cover is removed from the base and magnet. The cover is held down to the base by means ol. screws passing through holes il? in the bz se and tapped into corresponding holes 3S in the cover Securely held in place against the other of the sets of pole pieces is a U-shaped laminated core 39 provided with feet '40, said feet being drilled to permit screws to pass therethrougli into holes 41 in the base to secure the core to the base. Vound about the core is an induction coil 42 and mounted on the legs of the U-shaped core is a circuit controller 43. The controller comprises a brass or other non-magnetic metallic plate 44 straddling the tivo legs and secured to the legs by means of screws 45. One end of the plate 44 carries a Contact 4G. Cooperating With this Contact is a second contact 47 carried by a leaf spring 48 secured to but insulated from the plate 44 by means of a libre or other insulating block 49.

Riveted to the leaf spring a stud 5() passing freely through an aperture in the plate 44, and cooperating with the free end of the stud is a contact actuator 52 pivoted in a pair of ears 53 struck up from the plate 44. The actuator may be made of laminated material riveted together. It is essential that the contacts be not short circuited by the contact actuator and so in this instance the laminations Yforming'v the ac= or other in traitorv are olf iibjl" l. The actl dating ma shaped as shown l V' pressed. into ecnin 2G by the A actuated by nl to periodica .y i. f and. brcal; the circuit controlled by the contacts. rThe duction coil. is the ordinary type ha a primary vrii'iding 55 and a secondariv 'winding :5o. The primaria Winding is cor.- neeted by a lead 57 a point 58 `which is in electrical conneftif.,A one side of a condenser 59 ieeured to the coil heads and to the upper contact i-(3, 4i', as as o a magia-5to s strip ell. secured to the other oi.

- lvlie secondary a ternrna 'o u ndi n g the coilv vinding is provicefl 6l, the upper end of which is in close pr' lin'iity te. but not in conA tactual engagement `with the permanent magnet to act as a safety sparli gap. il terminal 62 on the cover adapted to be connected with a spark plug S. l). is in electrical engagement with the terminal (3l.

The other side of the condenser through lead G3 and the other ends of the primary and secondary coil are grounded as through a Wire G4. The cover is also provided with a grounding spring 65 in electrical engagement `with the grounding strip GO, the binding post (5G connected with the spring bei adapted to be grounded through a switch ('37 when it is desired to ground the magneto and render lit inoperative.

'.lhe cover is also provided with an aperture G8 normally covered by a leaf G9 having a die sunk portion Y() fitting into the aperture and pivoted on a stud 71, a spring 72 serving` to removably hold the leaf in place. The aperture is placed opposite the contact points so as to permit inspection of the points Without disinembering the mag neto.

liron the above it can be seen that l have invented a particularly compact iuagneto having a base with but a simple unitary bearing ttor the rotor. The pole pieces enr bedded iu the base being all of a uniform height can all be machined easily at one operation and the parts are so formed as to be reanily separated into units for inspection,

r and replacement?, and may be as readplaced.

Having thus described my invention, I claim:

l. In a magneto, a noirmagnetic base block, said bloei: having magnet and coil. cere engaging pole pieces secured therein so that the magnet and coil core engaging faces of said pole pieces terminate in a connnon planea and end plate for said base block, an elongated rotor bearing in said end plate projecting Within the block, and a rotor encompassing the bearing having a shaft supported Wholly by said bearing.

l (il) lll) n magneto, a nonfinagneiie base Mock, paire of poie nieces secured in said bloei: terminating in a coinnon piane, a ioioi opeia'tiifeiy associated Wit-i1 said pole pieces` a eoie leaving a coil magnetically linked nerewith, a peil'nanent magnei'-, and means; 'ier retaining said coie and peimaneniJ magnet in piace in endwiee contant with the pole pieces secured in the block.

53. in a magneto, a non-magnetic base bleek, pairs oi noie pieces Semned in said 'block teiininatinn in a Common piane, a

i'otoi' opeiaiivei)v associated with Said pole pieces. a cere having a Geil magnetically linked therewith, a permanent magnet, means for cetainingg,p said core and permanent magnet in piace in Contact with Jshe pole pieces secured in the block, Contact maken and bi'eakei mounted. on the more, and means onthe vrotor to operaie the Contact niakei` and bieakei'.

i. In a niafcgtneio7 a base bleek, pains oi pele pieces therein, a iotoiA for said. pole pieces, a Gelre bearing a Coil Seeui'ed to one pair oi pole gieees, said coil eariying contacts, a permanent magnet resting on and. magnetically held to the other of the pole pieces7 a @over for embracing said. core, cnil and permanent magnet, means in said cover for aciditonaiij/Y ietaining,` the magnet in endwise position on the pole pieces and tei'- ininaie carried by the cover to engage Sairi coil contacte for the puipose described.

In testimony whereof, affix my Signature.

SAMUEL C. MCKEOWNm 

